Adds indexes to the netblock table (#2780)

Netblock is really big, so adding some indexes to the decimal IP fields
(used to do the actual locating) to speed things up.

maxmind/migrations/0002_add_indexes_to_decimal_ips.py

@@ -0,0 +1,31 @@
+# Generated by Django 3.2.21 on 2023-10-02 14:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("maxmind", "0001_add_geoname_and_netblock_tables"),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name="netblock",
+            index=models.Index(
+                fields=["decimal_ip_start"], name="maxmind_net_decimal_dfdb1a_idx"
+            ),
+        ),
+        migrations.AddIndex(
+            model_name="netblock",
+            index=models.Index(
+                fields=["decimal_ip_end"], name="maxmind_net_decimal_6166c4_idx"
+            ),
+        ),
+        migrations.AddIndex(
+            model_name="netblock",
+            index=models.Index(
+                fields=["decimal_ip_start", "decimal_ip_end"],
+                name="maxmind_net_decimal_ab7249_idx",
+            ),
+        ),
+    ]

maxmind/models.py

@@ -97,6 +97,11 @@ class Meta:
                 name="at_least_one_geoname_id",
             )
         ]
+        indexes = [
+            models.Index(fields=["decimal_ip_start"]),
+            models.Index(fields=["decimal_ip_end"]),
+            models.Index(fields=["decimal_ip_start", "decimal_ip_end"]),
+        ]
 
     def __str__(self):
         return f"{self.geoname_id}: {self.network} (IPv6 {self.is_ipv6}) start {self.ip_start} end {self.ip_end}"